Final answer:
The correct direct object pronoun to replace 'la télévision' is 'la'.
Step-by-step explanation:
The correct direct object pronoun to replace 'la télévision' in the second sentence is 'la'. So the correct sentence would be 'Je la regarde deux heures par jour.' Here, 'la' is the direct object pronoun representing 'la télévision' as the object of the verb 'regarde'.
Learn more about Direct object pronouns in French